I stayed quiet while a random teammate targeted one player and now our group feels worse

Three friends and I queued into a team game with one random player. During the first round, the random player began criticizing our support player, Nina. The comments started as strategy—wrong position, late ability—then became personal. He mocked her voice and asked whether she understood the game.

Nina muted him. The rest of us did not. We continued making callouts over him and occasionally told him to focus. I thought keeping the match calm was the best way to avoid escalation. We won, everyone left the lobby, and I expected the night to reset.

Instead, Nina said she was done playing. One friend told her the random player was obviously pathetic and should not matter. She replied, “He talked for fifteen minutes and the three people who know me acted like weather was happening.” Then she disconnected.

That sentence has stayed with me because it is accurate. We were not silent in the literal sense. We said “drop it” twice. But we kept coordinating with him, accepted his information, and finished the match as if the main goal was preserving the win. From Nina’s position, the person attacking her remained a functional member of our team while she had to remove herself from the conversation.

The group is now arguing about what we should have done. One friend says we should all have muted him immediately. Another says that would have hurt our chances and prevented us from hearing if he made a useful callout. I find that defense embarrassing when written plainly, yet I also know confrontation can make abusive people intensify.

I apologized to Nina without explaining my intention. She said she appreciated it but does not want to join voice chat with random teammates for a while. That is a reasonable boundary, not a complete repair.

What should a premade group agree to do next time? One clear warning, then everyone mutes and reports? Immediate group mute for personal attacks? Leave the match if possible? I want a protocol simple enough to follow while adrenaline is high. “We support our friend” should mean more than feeling privately disapproving while continuing to use the aggressor’s callouts.